Portable fan



FIG. 1 is a perspective view showing the new design;

FIG. 2 is a front side view thereof,

FIG. 3 is a rear side view thereof;

FIG. 4 is a left side view thereof, the right side being a mirror image of the left;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a perspective view showing a second embodiment of the new design;

FIG. 8 is a front side view showing the second embodiment of the new design;

FIG. 9 is a left side view showing the second embodiment of the new design, the right side being a mirror image of the left; and,

FIG. 10 is a top plan view showing the second embodiment of the new design.

The broken line showing of environmental structure in FIGS. 1-10 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a portable fan, as shown and described. 